Development of an optimized LSO/LuYAP phoswich detector head for the Lausanne ClearPET demonstrator

This paper describes the LSO/LuYAP phoswich detector head developed for the ClearPET small animal PET scanner demonstrator that is under construction in Lausanne within the Crystal Clear Collaboration. The detector head consists of a dual layer of 8/spl times/8 LSO and LuYAP crystal arrays coupled to a multi-anode photomultiplier tube (Hamamatsu R7600-M64). Equalistion of the LSO/LuYAP light collection is obtained through partial attenuation of the LSO scintillation light using a thin aluminum deposit of 20-35 nm on LSO and appropriate temperature regulation of the phoswich head between 30/spl deg/C to 60/spl deg/C. At 511keV, typical FWHM energy resolutions of the pixels of a phoswich head amounts to (28/spl plusmn/2)% for LSO and (25/spl plusmn/2)% for LuYAP. The LSO versus LuYAP crystal identification efficiency is better than 98%. Six detector modules have been mounted on a rotating gantry. Axial and tangential spatial resolutions were measured up to 4 cm from the scanner axis and compared to Monte Carlo simulations using GATE. FWHM spatial resolution ranges from 1.3 mm on axis to 2.6 mm at 4 cm from the axis.

[1]  Paul Kinahan,et al.  Analytic 3D image reconstruction using all detected events , 1989 .

[2]  C. Melcher,et al.  Cerium-doped lutetium oxyorthosilicate: a fast, efficient new scintillator , 1991, Conference Record of the 1991 IEEE Nuclear Science Symposium and Medical Imaging Conference.

[3]  R. Lecomte,et al.  A novel APD-based detector module for multi-modality PET/SPECT/CT scanners , 1998 .

[4]  Klaus Wienhard,et al.  Advantages using pulse shape discrimination to assign the depth of interaction information (DOI) from a multi-layer phoswich detector , 1998 .

[5]  R. Nutt,et al.  Investigation of depth-of-interaction by pulse shape discrimination in multicrystal detectors read out by avalanche photodiodes , 1998 .

[6]  Claire Labbé,et al.  An object-oriented library incorporating efficient projection/backprojection operators for volume reconstruction in 3D PET , 1999 .

[7]  H. Zaidi,et al.  Development of new mixed Lux(RE3+)1−xAP:Ce scintillators (RE3+=Y3+ or Gd3+): comparison with other Ce-doped or intrinsic scintillating crystals , 2000 .

[8]  Jurgen Seidel,et al.  Resolution uniformity and sensitivity of the NIH ATLAS small animal PET scanner: comparison to simulated LSO scanners without depth-of-interaction capability , 2001 .

[9]  P. Lecoq,et al.  Intrinsic energy resolution and light output of the Lu0.7Y0.3AP:Ce scintillator , 2002 .

[10]  G. Kemmerling,et al.  Comparison of LuYAP, LSO and BGO as scintillators for high resolution PET detectors , 2002, 2002 IEEE Nuclear Science Symposium Conference Record.

[11]  Horst Halling,et al.  Pulse shape discrimination of LSO and LuYAP scintillators for depth of interaction detection in PET , 2002 .

[12]  M. Moszynski,et al.  Scintillation properties and mechanism in Lu0.8Y0.2AlO3:Ce , 2002 .

[13]  Horst Halling,et al.  Coincidence detection by digital processing of free-running sampled pulses , 2002 .

[14]  H. Halling,et al.  Homogenization of the MultiChannel PM gain by inserting light attenuating masks , 2003, 2003 IEEE Nuclear Science Symposium. Conference Record (IEEE Cat. No.03CH37515).

[15]  G. Santin,et al.  GATE: a Geant4-based simulation platform for PET and SPECT integrating movement and time management , 2003 .

[16]  P. Lecoq,et al.  Scintillation properties of mixed LuYAP crystals in view of their use in a small animal PET scanner in phoswich configuration , 2003 .

[17]  Carole Lartizien,et al.  The ClearPET project , 2004 .

[18]  C Lartizien,et al.  GATE: a simulation toolkit for PET and SPECT. , 2004, Physics in medicine and biology.

[19]  Carole Lartizien,et al.  The ClearPET™ project: development of a 2nd generation high-performance small animal PET scanner , 2005 .

[20]  Horst Halling,et al.  Effects of crosstalk and gain nonuniformity using multichannel PMTs in the Clearpet® scanner , 2005 .